I have to agree with Daniel. There's no real good draw over $15. I'd love a shirt but changing my pledge from $15 to $75 for the shirt isn't a great deal. For me the digital art book isn't a big draw. And a boxed copy is more clutter for me since I've switched all my PC purchases to Steam. I really want this game but to get to 100k there needs to be better higher value goals to draw in more money. Shayne also makes a good point that marketing is super important. The only reason I knew about this was a friend that works for a related company told me.

The rewards are good (ALthough some t-shirts and stuff, maybe with retro battlechess artwork for the hipster kids, would be neat.

You guys really need to be bombing the chess forums, and the chess press in general with info on this. It really hasn't gotten any great publicity yet, and while the kickstarter hype bubble is on, its a wasted oportunity.

Just a general comment to this. I really love the concept and am a backer. But, honestly, what should intrique me to pledge more than $15? Concept Art book, which is digital and, thus, of almost no value to a collector? A digital collector's edition which I have no idea what is in? And a T/Shirt, which may be nice, but at $25 it is no big deal. But the best is FIFTY bucks for a name in the credits? Really? For the sake of success of this project, I beg you, please do have a look at the rewards.
Good luck.